<template>
	<div class="goodsinfo-container">
        <!-- 商品轮播图区域 -->
        <div class="mui-card">
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <swiper :lunbotuList="lunbotu" :isfull="false"></swiper>
                </div>
            </div>
        </div>

        <!-- 商品购买区域 -->
        <div class="mui-card">
            <div class="mui-card-header">{{ goodsinfo.title }}</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p class="price">
                        市场价：<del>￥{{ goodsinfo.market_price }}</del>&nbsp;&nbsp;销售价：<span class="now_price">￥{{ goodsinfo.sell_price }}</span>
                    </p>
                    <p>购买数量：<numbox @getcount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox></p>
                    <p>
                        <mt-button type="primary" size="small">立即购买</mt-button>
                        <mt-button type="danger" size="small" @click="addToShopCar">加入购物车</mt-button>
                    </p>
                </div>
            </div>
        </div>
        <!-- 代表商品的小球 -->
        <transition
            @before-enter="beforeEnter"
            @enter="enter"
            @after-enter="afterEnter">
            <div class="ball" v-show="ballFlag" ref="ball"></div>
        </transition>
        <!-- 商品参数区域 -->
        <div class="mui-card">
            <div class="mui-card-header">商品参数</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p>商品货号：{{ goodsinfo.goods_no }}</p>
                    <p>库存情况：{{ goodsinfo.stock_quantity }}件</p>
                    <p>上架时间：{{ goodsinfo.add_time | dateFormat }}</p>
                </div>
            </div>
            <div class="mui-card-footer">
                <mt-button type="primary" size="large" plain @click="goDesc(id)">图文介绍</mt-button>
                <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>                
            </div>
        </div>
	</div>
</template>

<script>
// 导入轮播图组件
import swiper from '../subcomponents/swiper.vue'
// 导入数字选择框组件
import numbox from "../subcomponents/goodsinfo_numbox.vue"

export default {
    data() {
        return {
            id: this.$route.params.id,
            lunbotu: [],
            goodsinfo: {},  //获取到的商品信息
            ballFlag: false, //控制小球隐藏和显示的标识符
            selectedCount: 1 //保存用户选中的商品数量，默认用户买1个
        };
    },
    created() {
        this.getLunbotu();
        this.getGoodsInfo();
    },
    methods: {
        getLunbotu() {
            this.$http.get("api/getthumimages/" + this.id).then(result => {
                if(result.body.status === 0) {
                    // 先循环轮播图数组的每一项,为item添加img属性,因为轮播图组件只认识item.img,不认识item.src
                    result.body.message.forEach(item => {
                        item.img = item.src;
                    });
                    this.lunbotu = result.body.message;
                }
            });
        },
        getGoodsInfo() {
            this.$http.get("api/goods/getinfo/" + this.id).then(result => {
                if(result.body.status === 0) {
                    this.goodsinfo = result.body.message[0];
                }
            })
        },
        goDesc(id) {
            // 点击使用编程式导航跳转到 图文介绍页面
            this.$router.push({ name: "goodsdesc", params: { id }});
        },
        goComment(id) {
            // 点击跳转到评论页面
            this.$router.push({ name: "goodscomment", params: { id }});
        },
        addToShopCar() {
            this.ballFlag = !this.ballFlag;
            // 拼接出一个要保存到store中car数组里的商品信息对象
            var goodsinfo = {
                id: this.id,
                count: this.selectedCount,
                price: this.goodsinfo.sell_price,
                selected: true
            }
            // 调用store中的mutations将商品加入购物车
            this.$store.commit('addToCar', goodsinfo)
        },
        beforeEnter(el) {
            el.style.transform = "translate(0, 0)";
        },
        enter(el, done) {
            // 获取小球在页面中的位置
            const ballPosition = this.$refs.ball.getBoundingClientRect();
            // 获取徽标在页面中的位置
            const badgePosition = document.getElementById("badge").getBoundingClientRect();

            // 获取小球的位移
            const xDist = badgePosition.left - ballPosition.left;
            const yDist = badgePosition.top - ballPosition.top;

            el.offsetWidth;
            el.style.transform = `translate(${xDist}px,${yDist}px)`;
            el.style.transition = "all 0.5s cubic-bezier(.4, -0.3, 1, .68)";
            done();
        },
        afterEnter(el) {
            this.ballFlag = !this.ballFlag;
        },
        getSelectedCount(count) {
            //当子组件把选中的数量传递给父组件的时候，把该值保存到data.getSelectedCount中
            this.selectedCount = count;
            // console.log("父组件拿到的数量值为： " + this.selectedCount);
        }
    },
    components: {
        swiper,
        numbox
    }
};
</script>

<style lang="scss" scoped>
.goodsinfo-container {
    background-color: #eee;
    overflow: hidden;

    .now_price {
        color: red;
        font-size: 16px;
        font-weight: bold;
    }

    .mui-card-footer {
        display: block;
        button {
            margin: 15px 0;
        }
    }

    .ball {
        width: 15px;
        height: 15px;
        border-radius: 50px;
        background-color: red;
        position: absolute;
        z-index: 99;
        top: 390px;
        left: 146px;
    }
}
</style>
